Testing Your APIs: Postman, Newman, and Beyond

Feb 10, 20212 likes1,821 views

The document discusses testing APIs with Postman and Newman. It covers the goals of API testing such as validating inputs/outputs and interface behavior. It demonstrates using simple request tests with cURL, testing with Postman and ChaiJS assertions, and automating tests with Newman CLI. It provides an overview of putting these techniques together in a "mini-pipeline" for building, local testing, deploying, and remote testing APIs.

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Testing your APIs with
Postman and Newman
Mike Amundsen
@mamund
youtube.com/mamund

copyright © 2021 by amundsen.com, inc. -- all rights reserved
2

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"From design to code to test to
deployment, unlock hidden business value
and release stable and scalable web APIs
that meet customer needs and solve
important business problems in a
consistent and reliable manner."
-- Pragmatic Publishers
g.mamund.com/GreatWebAPIs

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Overview
● The Goals of API Testing
● Simple Request Testing with SRTs
● Testing with Postman UI and ChaiJS Assertions
● Automate Testing with Newman CLI
● Summary

copyright © 2021 by amundsen.com, inc. -- all rights reserved
The Goals of API Testing

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Goals of API Testing
● "Outside-in" approach
● Validating resource inputs/outputs
● Confirming interface behavior

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Goals of API Testing
● "Outside-in" approach
○ We can only "see" the API
○ Your tests are for the interface, not the code
● Validating resource inputs/outputs
● Confirming interface behavior

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Goals of API Testing
● "Outside-in" approach
● Validating resource inputs/outputs
○ Confirm the URL exists, responds
○ Validate the methods, parameters, and response bodies
● Confirming interface behavior

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Let's see how that works...

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Simple Request Testing with SRTs

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Simple Request Testing (SRTs)
● SRTs are a great way to validate endpoints
● Use curl to execute simple requests against your API
● "Eyeball" the results to make sure it works as expected

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Simple Request Testing (SRTs)
● SRTs are a great way to validate endpoints
○ Confirm URLs respond
○ Validate 200 OK & body
● Use curl to execute simple requests against your API
● "Eyeball" the results to make sure it works as expected

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SRT Demo

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Testing with Postman UI and ChaiJS

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Postman UI and ChaiJS
● Postman API platform (2014)
● Collections -> Folders -> Requests
● Embedded libraries for scripting tests
● ChaiJS assertions

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Postman UI and ChaiJS
● Postman API platform (2014)
○ Design, build, mock, test, etc.
○ May require a client-side install
● Collections -> Folders -> Requests
● Embedded libraries for scripting tests
● ChaiJS assertions

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Postman UI and ChaiJS
● Postman API platform (2014)
● Collections -> Folders -> Requests
○ You can import/export collections
○ Supports global, collection, and environment memory sharing
● Embedded libraries for scripting tests
● ChaiJS assertions

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Postman UI Demo

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Automate Testing with Newman CLI

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Automate Testing with Newman CLI
● Newman (2016) is the command-line client for Postman
● Use Postman API for managing collections & environments
● Newman + API = custom test-run scripts
● Add -reporters option for improved output

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Automate Testing with Newman CLI
● Newman is the command-line client for Postman (2016)
○ npm install -g newman
○ newman run <collection>
● Postman API for managing collections & environments
● Newman + API = custom test-run scripts
● Add -reporters option for improved output

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Automate Testing with Newman CLI
● Newman is the command-line client for Postman (2016)
● Postman API for managing collections & environments
○ Generate your API key
○ Use curl to make postman API calls for collections & environments
● Newman + API = custom test-run scripts
● Add -reporters option for improved output

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Newman CLI Demo

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Putting it all together

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Putting It All Together w/ a "mini-pipeline"
● Build
● Local Test
● Deploy
● Remote Test

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Putting It All Together w/ a "mini-pipeline"
● Build
○ npm run dev
● Local Test
○ test-run.sh local
● Deploy
○ git push heroku master
● Remote Test
○ test-run.sh remote

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mini-pipeline Demo

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And So...

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Goals of API Testing
● Outside-in approach
● Testing the API's behavior
● Happy- and Sad-Path testing

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Validate Endpoints with SRTs
● Focus on URLs and arguments
● Use the srt.sh script with curl
● That's really "testing" yet <g>

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Test Behavior with Postman and ChaiJS
● Create Postman test collections
● Use ChaiJS assertion library BDD-style "outside-in"
● Build up reusable test modules and share via global memory
● Be sure to use both Happy- and Sad-Path tests

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Automate Testing with Newman CLI
● Newman is the Postman CLI client
● Automate testing using test-run.sh
● Optionally, use -r htmlextra option for HTML output

copyright © 2021 by amundsen.com, inc. -- all rights reserved
That's all there is!

copyright © 2021 by amundsen.com, inc. -- all rights reserved
Resources
● "Design and Build Great Web APIs"
g.mamund.com/greatwebapis
● This talk (slides, links, etc.)
g.mamund.com/2021-02-postman-galaxy-testing

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Even though at surface level ‘java.lang.OutOfMemoryError’ appears as one single error; underlyingly there are 9 types of OutOfMemoryError. Each type of OutOfMemoryError has different causes, diagnosis approaches and solutions. This session equips you with the knowledge, tools, and techniques needed to troubleshoot and conquer OutOfMemoryError in all its forms, ensuring smoother, more efficient Java applications.

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Ensuring the reliability of your Java applications is critical in today's fast-paced world. But how do you identify and fix production issues before they get worse? With cloud-native applications, it can be even more difficult because you can't log into the system to get some of the data you need. The answer lies in observability - and in particular, OpenTelemetry. In this session, I'll show you how I used OpenTelemetry to solve several production problems. You'll learn how I uncovered critical issues that were invisible without the right telemetry data - and how you can do the same. OpenTelemetry provides the tools you need to understand what's happening in your application in real time, from tracking down hidden bugs to uncovering system bottlenecks. These solutions have significantly improved our applications' performance and reliability. A key concept we will use is traces. Architecture diagrams often don't tell the whole story, especially in microservices landscapes. I'll show you how traces can help you build a service graph and save you hours in a crisis. A service graph gives you an overview and helps to find problems. Whether you're new to observability or a seasoned professional, this session will give you practical insights and tools to improve your application's observability and change the way how you handle production issues. Solving problems is much easier with the right data at your fingertips.

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GC Tuning: A Masterpiece in Performance EngineeringTier1 app

Download MathType Crack Version 2025???Google

A Comprehensive Guide to CRM Software Benefits for Every Business StageSynapseIndia

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Testing Your APIs: Postman, Newman, and Beyond

3. copyright © 2021 by amundsen.com, inc. -- all rights reserved "From design to code to test to deployment, unlock hidden business value and release stable and scalable web APIs that meet customer needs and solve important business problems in a consistent and reliable manner." -- Pragmatic Publishers g.mamund.com/GreatWebAPIs

4. copyright © 2021 by amundsen.com, inc. -- all rights reserved Overview ● The Goals of API Testing ● Simple Request Testing with SRTs ● Testing with Postman UI and ChaiJS Assertions ● Automate Testing with Newman CLI ● Summary

7. copyright © 2021 by amundsen.com, inc. -- all rights reserved Goals of API Testing ● "Outside-in" approach ○ We can only "see" the API ○ Your tests are for the interface, not the code ● Validating resource inputs/outputs ● Confirming interface behavior

8. copyright © 2021 by amundsen.com, inc. -- all rights reserved Goals of API Testing ● "Outside-in" approach ● Validating resource inputs/outputs ○ Confirm the URL exists, responds ○ Validate the methods, parameters, and response bodies ● Confirming interface behavior

9. copyright © 2021 by amundsen.com, inc. -- all rights reserved Goals of API Testing ● "Outside-in" approach ● Validating resource inputs/outputs ● Confirming interface behavior ○ Validate expected behaviors ○ Happy-path tests (200 OK) ○ Sad-path tests (400 Bad Request)

12. copyright © 2021 by amundsen.com, inc. -- all rights reserved Simple Request Testing (SRTs) ● SRTs are a great way to validate endpoints ● Use curl to execute simple requests against your API ● "Eyeball" the results to make sure it works as expected

13. copyright © 2021 by amundsen.com, inc. -- all rights reserved Simple Request Testing (SRTs) ● SRTs are a great way to validate endpoints ○ Confirm URLs respond ○ Validate 200 OK & body ● Use curl to execute simple requests against your API ● "Eyeball" the results to make sure it works as expected

14. copyright © 2021 by amundsen.com, inc. -- all rights reserved Simple Request Testing (SRTs) ● SRTs are a great way to validate endpoints ● Use curl to execute simple requests against your API ○ curl or wget or any other simple HTTP CLI client works fine ○ Pipe results to a file (output.txt) and check into source control ● "Eyeball" the results to make sure it works as expected

15. copyright © 2021 by amundsen.com, inc. -- all rights reserved Simple Request Testing (SRTs) ● SRTs are a great way to validate endpoints ● Use curl to execute simple requests against your API ● "Eyeball" the results to make sure it works as expected ○ Does the request fail? ○ Does the body "look ok?"

18. copyright © 2021 by amundsen.com, inc. -- all rights reserved Postman UI and ChaiJS ● Postman API platform (2014) ● Collections -> Folders -> Requests ● Embedded libraries for scripting tests ● ChaiJS assertions

19. copyright © 2021 by amundsen.com, inc. -- all rights reserved Postman UI and ChaiJS ● Postman API platform (2014) ○ Design, build, mock, test, etc. ○ May require a client-side install ● Collections -> Folders -> Requests ● Embedded libraries for scripting tests ● ChaiJS assertions

20. copyright © 2021 by amundsen.com, inc. -- all rights reserved Postman UI and ChaiJS ● Postman API platform (2014) ● Collections -> Folders -> Requests ○ You can import/export collections ○ Supports global, collection, and environment memory sharing ● Embedded libraries for scripting tests ● ChaiJS assertions

21. copyright © 2021 by amundsen.com, inc. -- all rights reserved Postman UI and ChaiJS ● Postman API platform (2014) ● Collections -> Folders -> Requests ● Embedded libraries for scripting tests ○ 12+ client-side libraries ○ 10+ NodeJS libraries ● ChaiJS assertions

22. copyright © 2021 by amundsen.com, inc. -- all rights reserved Postman UI and ChaiJS ● Postman API platform (2014) ● Collections -> Folders -> Requests ● Embedded libraries for scripting tests ● ChaiJS assertions ○ BDD-style assertions ○ Fluent interface ○ should(...), expect(...), assert(...)

25. copyright © 2021 by amundsen.com, inc. -- all rights reserved Automate Testing with Newman CLI ● Newman (2016) is the command-line client for Postman ● Use Postman API for managing collections & environments ● Newman + API = custom test-run scripts ● Add -reporters option for improved output

26. copyright © 2021 by amundsen.com, inc. -- all rights reserved Automate Testing with Newman CLI ● Newman is the command-line client for Postman (2016) ○ npm install -g newman ○ newman run <collection> ● Postman API for managing collections & environments ● Newman + API = custom test-run scripts ● Add -reporters option for improved output

27. copyright © 2021 by amundsen.com, inc. -- all rights reserved Automate Testing with Newman CLI ● Newman is the command-line client for Postman (2016) ● Postman API for managing collections & environments ○ Generate your API key ○ Use curl to make postman API calls for collections & environments ● Newman + API = custom test-run scripts ● Add -reporters option for improved output

28. copyright © 2021 by amundsen.com, inc. -- all rights reserved Automate Testing with Newman CLI ● Newman is the command-line client for Postman (2016) ● Postman API for managing collections & environments ● Newman + API = custom test-run scripts ○ Pull proper collections/environments (API) ○ Run tests and report results (Newman) ○ test-run.sh local ● Add -reporters option for improved output

29. copyright © 2021 by amundsen.com, inc. -- all rights reserved Automate Testing with Newman CLI ● Newman is the command-line client for Postman (2016) ● Postman API for managing collections & environments ● Newman + API = custom test-run scripts ● Add -reporters option for improved output ○ npm install -g newman-reporter-htmlextra ○ newman run <collection> -r htmlextra

33. copyright © 2021 by amundsen.com, inc. -- all rights reserved Putting It All Together w/ a "mini-pipeline" ● Build ○ npm run dev ● Local Test ○ test-run.sh local ● Deploy ○ git push heroku master ● Remote Test ○ test-run.sh remote

38. copyright © 2021 by amundsen.com, inc. -- all rights reserved Test Behavior with Postman and ChaiJS ● Create Postman test collections ● Use ChaiJS assertion library BDD-style "outside-in" ● Build up reusable test modules and share via global memory ● Be sure to use both Happy- and Sad-Path tests

39. copyright © 2021 by amundsen.com, inc. -- all rights reserved Automate Testing with Newman CLI ● Newman is the Postman CLI client ● Automate testing using test-run.sh ● Optionally, use -r htmlextra option for HTML output

41. copyright © 2021 by amundsen.com, inc. -- all rights reserved Resources ● "Design and Build Great Web APIs" g.mamund.com/greatwebapis ● This talk (slides, links, etc.) g.mamund.com/2021-02-postman-galaxy-testing

Testing Your APIs: Postman, Newman, and Beyond

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